Before downloading the macOS® App, we need to know what type of "processor" or "chip" you have. To check this, do the following:

  1. At the top left, open the Apple menu.
  2. Select About This Mac®.
  3. In the Overview tab, find "Processor" or "Chip".
  4. See if it says Intel® or Apple®.
  5. Select the button below that matches.